qeth: rework fast path

Remove unnecessary traces. Remove unnecessary wrappers for skb
functions.

Signed-off-by: Frank Blaschka <frank.blaschka@de.ibm.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>

4 files changed, 13 insertions, 98 deletions

diff --git a/drivers/s390/net/qeth_core.h b/drivers/s390/net/qeth_core.h
index 8dd83d9209..699ac11deb 100644
--- a/drivers/s390/net/qeth_core.h
+++ b/drivers/s390/net/qeth_core.h
@@ -758,27 +758,6 @@ static inline int qeth_get_micros(void)
         return (int) (get_clock() >> 12);
 }
 
-static inline void *qeth_push_skb(struct qeth_card *card, struct sk_buff *skb,
-                int size)
-{
-        void *hdr;
-
-        hdr = (void *) skb_push(skb, size);
-        /*
-         * sanity check, the Linux memory allocation scheme should
-         * never present us cases like this one (the qdio header size plus
-         * the first 40 bytes of the paket cross a 4k boundary)
-         */
-        if ((((unsigned long) hdr) & (~(PAGE_SIZE - 1))) !=
-            (((unsigned long) hdr + size +
-            QETH_IP_HEADER_SIZE) & (~(PAGE_SIZE - 1)))) {
-                PRINT_ERR("Misaligned packet on interface %s. Discarded.",
-                        QETH_CARD_IFNAME(card));
-                return NULL;
-        }
-        return hdr;
-}
-
 static inline int qeth_get_ip_version(struct sk_buff *skb)
 {
         switch (skb->protocol) {
@@ -791,6 +770,12 @@ static inline int qeth_get_ip_version(struct sk_buff *skb)
         }
 }
 
+static inline void qeth_put_buffer_pool_entry(struct qeth_card *card,
+                struct qeth_buffer_pool_entry *entry)
+{
+        list_add_tail(&entry->list, &card->qdio.in_buf_pool.entry_list);
+}
+
 struct qeth_eddp_context;
 extern struct ccwgroup_driver qeth_l2_ccwgroup_driver;
 extern struct ccwgroup_driver qeth_l3_ccwgroup_driver;
@@ -828,8 +813,6 @@ struct qeth_cmd_buffer *qeth_get_ipacmd_buffer(struct qeth_card *,
 int qeth_query_setadapterparms(struct qeth_card *);
 int qeth_check_qdio_errors(struct qdio_buffer *, unsigned int,
                        unsigned int, const char *);
-void qeth_put_buffer_pool_entry(struct qeth_card *,
-                           struct qeth_buffer_pool_entry *);
 void qeth_queue_input_buffer(struct qeth_card *, int);
 struct sk_buff *qeth_core_get_next_skb(struct qeth_card *,
                 struct qdio_buffer *, struct qdio_buffer_element **, int *,
@@ -865,8 +848,6 @@ int qeth_send_control_data(struct qeth_card *, int, struct qeth_cmd_buffer *,
         void *reply_param);
 int qeth_get_cast_type(struct qeth_card *, struct sk_buff *);
 int qeth_get_priority_queue(struct qeth_card *, struct sk_buff *, int, int);
-struct sk_buff *qeth_prepare_skb(struct qeth_card *, struct sk_buff *,
-                 struct qeth_hdr **);
 int qeth_get_elements_no(struct qeth_card *, void *, struct sk_buff *, int);
 int qeth_do_send_packet_fast(struct qeth_card *, struct qeth_qdio_out_q *,
                         struct sk_buff *, struct qeth_hdr *, int,
diff --git a/drivers/s390/net/qeth_core_main.c b/drivers/s390/net/qeth_core_main.c
index 23a46340ff..820c332096 100644
--- a/drivers/s390/net/qeth_core_main.c
+++ b/drivers/s390/net/qeth_core_main.c
@@ -2252,14 +2252,6 @@ void qeth_print_status_message(struct qeth_card *card)
 }
 EXPORT_SYMBOL_GPL(qeth_print_status_message);
 
-void qeth_put_buffer_pool_entry(struct qeth_card *card,
-                struct qeth_buffer_pool_entry *entry)
-{
-        QETH_DBF_TEXT(TRACE, 6, "ptbfplen");
-        list_add_tail(&entry->list, &card->qdio.in_buf_pool.entry_list);
-}
-EXPORT_SYMBOL_GPL(qeth_put_buffer_pool_entry);
-
 static void qeth_initialize_working_pool_list(struct qeth_card *card)
 {
         struct qeth_buffer_pool_entry *entry;
@@ -2600,7 +2592,6 @@ void qeth_queue_input_buffer(struct qeth_card *card, int index)
         int rc;
         int newcount = 0;
 
-        QETH_DBF_TEXT(TRACE, 6, "queinbuf");
         count = (index < queue->next_buf_to_init)?
                 card->qdio.in_buf_pool.buf_count -
                 (queue->next_buf_to_init - index) :
@@ -2789,8 +2780,6 @@ static void qeth_flush_buffers(struct qeth_qdio_out_q *queue, int under_int,
         int i;
         unsigned int qdio_flags;
 
-        QETH_DBF_TEXT(TRACE, 6, "flushbuf");
-
         for (i = index; i < index + count; ++i) {
                 buf = &queue->bufs[i % QDIO_MAX_BUFFERS_PER_Q];
                 buf->buffer->element[buf->next_element_to_fill - 1].flags |=
@@ -3034,49 +3023,6 @@ int qeth_get_priority_queue(struct qeth_card *card, struct sk_buff *skb,
 }
 EXPORT_SYMBOL_GPL(qeth_get_priority_queue);
 
-static void __qeth_free_new_skb(struct sk_buff *orig_skb,
-                struct sk_buff *new_skb)
-{
-        if (orig_skb != new_skb)
-                dev_kfree_skb_any(new_skb);
-}
-
-static inline struct sk_buff *qeth_realloc_headroom(struct qeth_card *card,
-                struct sk_buff *skb, int size)
-{
-        struct sk_buff *new_skb = skb;
-
-        if (skb_headroom(skb) >= size)
-                return skb;
-        new_skb = skb_realloc_headroom(skb, size);
-        if (!new_skb)
-                PRINT_ERR("Could not realloc headroom for qeth_hdr "
-                          "on interface %s", QETH_CARD_IFNAME(card));
-        return new_skb;
-}
-
-struct sk_buff *qeth_prepare_skb(struct qeth_card *card, struct sk_buff *skb,
-                 struct qeth_hdr **hdr)
-{
-        struct sk_buff *new_skb;
-
-        QETH_DBF_TEXT(TRACE, 6, "prepskb");
-
-        new_skb = qeth_realloc_headroom(card, skb,
-                        sizeof(struct qeth_hdr));
-        if (!new_skb)
-                return NULL;
-
-        *hdr = ((struct qeth_hdr *)qeth_push_skb(card, new_skb,
-                        sizeof(struct qeth_hdr)));
-        if (*hdr == NULL) {
-                __qeth_free_new_skb(skb, new_skb);
-                return NULL;
-        }
-        return new_skb;
-}
-EXPORT_SYMBOL_GPL(qeth_prepare_skb);
-
 int qeth_get_elements_no(struct qeth_card *card, void *hdr,
                      struct sk_buff *skb, int elems)
 {
@@ -3097,8 +3043,8 @@ int qeth_get_elements_no(struct qeth_card *card, void *hdr,
 }
 EXPORT_SYMBOL_GPL(qeth_get_elements_no);
 
-static void __qeth_fill_buffer(struct sk_buff *skb, struct qdio_buffer *buffer,
-                int is_tso, int *next_element_to_fill)
+static inline void __qeth_fill_buffer(struct sk_buff *skb,
+        struct qdio_buffer *buffer, int is_tso, int *next_element_to_fill)
 {
         int length = skb->len;
         int length_here;
@@ -3140,15 +3086,13 @@ static void __qeth_fill_buffer(struct sk_buff *skb, struct qdio_buffer *buffer,
         *next_element_to_fill = element;
 }
 
-static int qeth_fill_buffer(struct qeth_qdio_out_q *queue,
+static inline int qeth_fill_buffer(struct qeth_qdio_out_q *queue,
                 struct qeth_qdio_out_buffer *buf, struct sk_buff *skb)
 {
         struct qdio_buffer *buffer;
         struct qeth_hdr_tso *hdr;
         int flush_cnt = 0, hdr_len, large_send = 0;
 
-        QETH_DBF_TEXT(TRACE, 6, "qdfillbf");
-
         buffer = buf->buffer;
         atomic_inc(&skb->users);
         skb_queue_tail(&buf->skb_list, skb);
@@ -3207,8 +3151,6 @@ int qeth_do_send_packet_fast(struct qeth_card *card,
         int flush_cnt = 0;
         int index;
 
-        QETH_DBF_TEXT(TRACE, 6, "dosndpfa");
-
         /* spin until we get the queue ... */
         while (atomic_cmpxchg(&queue->state, QETH_OUT_Q_UNLOCKED,
                               QETH_OUT_Q_LOCKED) != QETH_OUT_Q_UNLOCKED);
@@ -3260,8 +3202,6 @@ int qeth_do_send_packet(struct qeth_card *card, struct qeth_qdio_out_q *queue,
         int tmp;
         int rc = 0;
 
-        QETH_DBF_TEXT(TRACE, 6, "dosndpkt");
-
         /* spin until we get the queue ... */
         while (atomic_cmpxchg(&queue->state, QETH_OUT_Q_UNLOCKED,
                               QETH_OUT_Q_LOCKED) != QETH_OUT_Q_UNLOCKED);
@@ -3958,7 +3898,6 @@ struct sk_buff *qeth_core_get_next_skb(struct qeth_card *card,
         int use_rx_sg = 0;
         int frag = 0;
 
-        QETH_DBF_TEXT(TRACE, 6, "nextskb");
         /* qeth_hdr must not cross element boundaries */
         if (element->length < offset + sizeof(struct qeth_hdr)) {
                 if (qeth_is_last_sbale(element))
diff --git a/drivers/s390/net/qeth_l2_main.c b/drivers/s390/net/qeth_l2_main.c
index e6092829a5..ef07e9cadf 100644
--- a/drivers/s390/net/qeth_l2_main.c
+++ b/drivers/s390/net/qeth_l2_main.c
@@ -632,8 +632,6 @@ static int qeth_l2_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
         enum qeth_large_send_types large_send = QETH_LARGE_SEND_NO;
         struct qeth_eddp_context *ctx = NULL;
 
-        QETH_DBF_TEXT(TRACE, 6, "l2xmit");
-
         if ((card->state != CARD_STATE_UP) || !card->lan_online) {
                 card->stats.tx_carrier_errors++;
                 goto tx_drop;
@@ -655,9 +653,12 @@ static int qeth_l2_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
         if (card->info.type == QETH_CARD_TYPE_OSN)
                 hdr = (struct qeth_hdr *)skb->data;
         else {
-                new_skb = qeth_prepare_skb(card, skb, &hdr);
+                /* create a clone with writeable headroom */
+                new_skb = skb_realloc_headroom(skb, sizeof(struct qeth_hdr));
                 if (!new_skb)
                         goto tx_drop;
+                hdr = (struct qeth_hdr *)skb_push(new_skb,
+                                                sizeof(struct qeth_hdr));
                 qeth_l2_fill_header(card, hdr, new_skb, ipv, cast_type);
         }
 
@@ -744,7 +745,6 @@ static void qeth_l2_qdio_input_handler(struct ccw_device *ccwdev,
         int index;
         int i;
 
-        QETH_DBF_TEXT(TRACE, 6, "qdinput");
         card = (struct qeth_card *) card_ptr;
         net_dev = card->dev;
         if (card->options.performance_stats) {
diff --git a/drivers/s390/net/qeth_l3_main.c b/drivers/s390/net/qeth_l3_main.c
index ce23169587..50545a1f6b 100644
--- a/drivers/s390/net/qeth_l3_main.c
+++ b/drivers/s390/net/qeth_l3_main.c
@@ -2557,8 +2557,6 @@ static int qeth_l3_do_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
 static void qeth_l3_fill_header(struct qeth_card *card, struct qeth_hdr *hdr,
                 struct sk_buff *skb, int ipv, int cast_type)
 {
-        QETH_DBF_TEXT(TRACE, 6, "fillhdr");
-
         memset(hdr, 0, sizeof(struct qeth_hdr));
         hdr->hdr.l3.id = QETH_HEADER_TYPE_LAYER3;
         hdr->hdr.l3.ext_flags = 0;
@@ -2637,8 +2635,6 @@ static int qeth_l3_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
         enum qeth_large_send_types large_send = QETH_LARGE_SEND_NO;
         struct qeth_eddp_context *ctx = NULL;
 
-        QETH_DBF_TEXT(TRACE, 6, "l3xmit");
-
         if ((card->info.type == QETH_CARD_TYPE_IQD) &&
             (skb->protocol != htons(ETH_P_IPV6)) &&
             (skb->protocol != htons(ETH_P_IP)))
@@ -2982,7 +2978,6 @@ static void qeth_l3_qdio_input_handler(struct ccw_device *ccwdev,
         int index;
         int i;
 
-        QETH_DBF_TEXT(TRACE, 6, "qdinput");
         card = (struct qeth_card *) card_ptr;
         net_dev = card->dev;
         if (card->options.performance_stats) {